NOAO >   Observing Info >   Approved Programs >   2001B-0338

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Proposal Information for 2001B-0338


PI: Jon P. Fulbright, Dominion Astrophysical Observatory, jon.fulbright@nrc.ca
Address: 5071 W. Saanich Rd, Victoria, BC V9E-2E7, Canada

Title: Signatures of Accreted Planetary Material in the Hyades

Abstract: Recent studies of stars that host planets (Gonzalez et al 2001, Santos et al. 2001) show that the host stars show abundance enhancement with respect to normal disk stars. Smith et al. (2001) further showed that a subsample of these host stars show signs of accretion of material enhanced in refractory elements. A weakness in this study is that it may be difficult to disentangle the effects of accretion against the effects of galactic chemical evolution, especially in the case of comparing individual field stars. As a test of whether accretion of processed protoplanetary material is a significant contributor to the surface abundances of disk stars, we propose to determine the abundances of volatile and refractory elements within the nearby, metal-rich Hyades open cluster. Signs of accreted matter should show up in stars with shallow or non-existent surface convection zones (F and early G stars), while stars with larger surface convective zones (giants and later spectral type dwarfs) should not. An additional advantage to working within a cluster is that the common distance and position on color-magnitude diagram can be used to set accurate relative atmospheric parameters, enhancing the quality of relative abundance determinations.


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